Friction closure cap



April 10, 1928.

E. SCOFIELD FRICTION CLOSURE CAP Filed May '7. 1926 W W l BYn M ATTOR Y Patented Apr. l0, 1928.

UNITED A-s'mres PATENT ori-ICL EDGAR SCOFIELD, OF NEW YORK, N. Y'., ASSIGNOR TO ANCHOR CAP ANDv CIlOSURE CORPORATION, 0F LONG ISLAND CITY, NEW YORK, A CORPORATION OF NEW YORK.

Fmcmron oLosURE CA2.

Application iiled May 7,

The present invention relates broadly to packaging and more specially to a closure cap of the friction type. i

The present invention comprises an improvement upon the type of friction closure cap illustrated in1 the Ramsey Patent No. 1,327,963, January 13, 1920. o

Fric `on closures which have the retaining friction applied, to substantially. a cylindrical surface ot' glass jars, ,tumblers, or the like, are bestl held in position where the side frictioiris applied at a point suliciently below the mouth of the container to bring the point ot contact between the cap andthe vessel below the part of the vessel formed by the ring mold. i

The ring mold used upon the mouth of such vessels when the 'vessel is being made, is lifted vertically after the mouth has been pressed and this ring mold? is provided with a suiiicient clearance taper to permit the ring to be removed without injuring the ware. This produces an inclined' surface adjacent the mouth oi the container in the form of the. frustum ot' a cone. Where friction in the nature otl metal to glass contact is applied on this conical surface there is a tendency to cause the cap to wedge otf'of the vessel.

The present invention comprises'a closure' cap ot' the Jfriction type with the line of contact between the cap and the container arranged to occur adjacent the lower portion ot the cap. Furthermore, the stresses in the side wall ot' the cap where it bears on the containers are letlective insuch manner as to tend to resist the movement of the cap from the vessel. 1

' Other and furt er objects of the present invention will in part ,be obvious and Will in part be pointed outl hereinafter in the specification following by `reference to the accompanying drawings lforming a" part thereo i Figure l is asectional view through a cap in accordance \vith.the present invention. v

Figure 2 is an enlarged sectional view of a portion of the cap in position on the mouth of a suitable container. t

Figure 3 is a dia rammatic view illustrat? ing the forces ten ing to retain the cap in position on a substantially cylindrical side walled vessel.

Referring now more specially to the draw- 192s. serial No. 107,404.

ings, the present invention comprises a closure cap having a cover portion l provided with a depending skirt 2 which terminates in a wire edge 4. The skirt of the cap is concave between the top and bottom thereot and is provided with indentations 5 which form frictional lugs that engage the surface of the glass container 6 to hold the cap in position thereon. The indentat-ions or corrugations are constructed to cause the point of contact between the glass and the cap to occur as at 7 adjacent the Wire edge 4:.

I t will be notedthat the wire edge comprises a roll of the metal 'arranged in such manner that the skirt meets theA Wire edge in a line substantially coincident Wit-h a radii of the coil. This arrangement causes the wire edge to very stitly support the corrugations in the skirt.

The abrupt angle illustrated by the arrow' A, Fig. 3, at which the bottom of the skirt approaches the point of contact 7 causes this. portion of the skirt to tightlygrip the glass and because of the surface irregularities occurring yin the glass similar irregulari- ,ties in the metal of the cap act as ratchets to resist the removal of the cap from the jar. Having described my invention, I claim: 1. A closure cap having a cover portion and a skirt portion, said skirt portion having -frictional engaging means provided therein, .p

said means comprising curved members having anabrupt curvature in the lower portion and a lesser curvature in the upper portion to provide the point of contact adjacent the lower edge of the skirt of the cap.

2. A closure cap having a cover portion and a skirt portion, said skirt portion having frictional engaging means provided therein, said means comprisingv curved members having an abrupt curvature in the lower .portion and a lesser curvature in the upper portion to provide the point of Contact adj acent the lower edge ot the skirt of the cap,

and a wire edge at the lower edge of the cap to support the sealing forces.

3. A closure cap having a. non-expansible cover portion and a skirt portion, said skirt portion having frictional engaging means provided therein, said means comprising curved members having an abrupt curvature in the lower portion anda lesser curvature in the upper portion to provide the point of contact adjacent the lowerv edge of the edge'of the capl to support the sealing forces, t,

. said skirt meeting said wire edge on sub- 4central portion of'sid skirt.

stantially a diameter of the cross section of seid edge. A v

4. A closure cap comprising 'a cover portion ;v a skirt portion having frictional seuling means having a curved portion on a shortradius leading to the lower edgeof the skirt, and n curved portion on a. greater radius leading to the upper edge of the skirt, whereby the sealingezone is below the 5.' A-.closure cup comprising :i tion a skirt portion having fricti'oual seeling means having e curved portionY on a relatively short radius vlea/ding to the lower 'edge ofthe skirt, and a curve on a. longer radius` leading to the vcover portion, and -a wire vedge on the lower edge of the skirt.y 6.v A closure capcomprlsing u cover ortion, a. depending skirt, an annular rictional` seiling zone in lsaid skirt, said zone comprising an abrupt curvature in Vits lowerv pprtion and a lesser curvature in the upper portion to provide a zone of contact ad]a.

cent the lower edge of the skirt of the cap.

7. A closure cap comprisinga cover portion, u skirt, and frictional sealingi means comprising corrugations extending .transf versely'of said skirt and curved throughout their length, the portions' of said curved sealing means adapted to contact with the side Wall of the container being below .the central portions thereof.

l EDGAR SCOFELD. 

